I also had some tuning problems some time ago and the following patch helped with the situation:
http://www.linuxtv.org/pipermail/linux-dvb/2007-February/016078.html
It seems that it has something to do with the cards initial state as currently the tuner is working perfectly without any patches. But when I was having those tuning problems, nothing seemed to help - except the patch mentioned.
-Sami
----- Original Message -----
From: Magnus Hörlin <magnus@xxxxxxxxxx>
Date: Thursday, April 19, 2007 20:15
Subject: [linux-dvb] Re: 2 MSI Megasky 580s - different tuning results
To: linux-dvb@xxxxxxxxxxx
> Hi.
> I have five of them and I also came to the conclusion that
> there's
> something wrong with the agc settings. Where I live the signal
> is quite
> weak so I have a roof-mounted antenna amplifier with variable
> gain.
> None of the other six types of cards I've tried, PCI or USB,
> have any
> reception problems but with these I have to lower the gain on
> the
> amplifier for them to tune every time. And just like you, I have
> one
> that's a lot worse than the others. I have also tried every
> patch ever
> posted here without any improvements.
>
> /Magnus
>
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> http://www.linuxtv.org/cgi-bin/mailman/listinfo/linux-dvb
>
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